Hide the matched set providing a duration and optionally a callback function.

In the example below when the left button is pressed we hide the image below on the left of chicken masala using a slow 'duration'.

When the right button is pressed we first select all the images of chicken korma (class of 'curry3'). After this we use the .first() method to extract the first image
in the set and pass this through the callback function. Within the function we use the .next() method to cycle through the images, hiding each in turn with a animation
speed of 400 milliseconds.